Archive repository and link to lantzproject/lantz

[mtsolmn]

As this project has migrated to a new organization and has been inactive for 5 years, this project should be marked as inactive/deprecated in the settings (by archiving the repository). In addition, a comment should be added to the top of the README to notify users of the new project and redirect users to the currently maintained version of this project at https://github.com/lantzproject/lantz

This should similarly be done of the README on PyPI and by adding the Development Status :: 7 - Inactive classifier to the listing.

@hgrecco